31 research outputs found

    Markus Bauer/Siegfried Hoche (Hg.): Die Juden von Görlitz. Beiträge zur jüdischen Geschichte der Stadt Görlitz

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    Tree rings reveal globally coherent signature of cosmogenic radiocarbon events in 774 and 993 CE

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    This study was funded by the WSL-internal COSMIC project (5233.00148.001.01), the ETHZ (Laboratory of Ion Beam Physics), the Swiss National Science Foundation (SNF Grant 200021L_157187/1), and as the Czech Republic Grant Agency project no. 17-22102s.Though tree-ring chronologies are annually resolved, their dating has never been independently validated at the global scale. Moreover, it is unknown if atmospheric radiocarbon enrichment events of cosmogenic origin leave spatiotemporally consistent fingerprints. Here we measure the 14C content in 484 individual tree rings formed in the periods 770–780 and 990–1000 CE. Distinct 14C excursions starting in the boreal summer of 774 and the boreal spring of 993 ensure the precise dating of 44 tree-ring records from five continents. We also identify a meridional decline of 11-year mean atmospheric radiocarbon concentrations across both hemispheres. Corroborated by historical eye-witness accounts of red auroras, our results suggest a global exposure to strong solar proton radiation. To improve understanding of the return frequency and intensity of past cosmic events, which is particularly important for assessing the potential threat of space weather on our society, further annually resolved 14C measurements are needed.Publisher PDFPeer reviewe

    Markus Bauer/Siegfried Hoche (Hg.): Die Juden von Görlitz. Beiträge zur jüdischen Geschichte der Stadt Görlitz

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    Ludwig I. von Liegnitz und Brieg (1311-1398)

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    Rüther A. Ludwig I. von Liegnitz und Brieg (1311-1398). In: Herzig A, ed. Schlesier des 14. bis 20. Jahrhunderts. Schlesische Lebensbilder. Vol 8 . Insingen: Degener; 2004: 18-23

    Anna von Schweidnitz und Jauer (1339-1362)

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    Rüther A. Anna von Schweidnitz und Jauer (1339-1362). In: Herzig A, ed. Schlesier des 14. bis 20. Jahrhunderts. Schlesische Lebensbilder. Vol 8 . Insingen: Degener; 2004: 24-31

    Preczlaus von Pogarell (1299-1376)

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    Rüther A. Preczlaus von Pogarell (1299-1376). In: Herzig A, ed. Schlesier des 14. bis 20. Jahrhunderts. Schlesische Lebensbilder. Vol 8 . Insingen: Degener; 2004: 13-17
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